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One of the most efficient engines ever developed operates between 2100 K and 700 K. Its actual efficiency is 40%. What percentage of its maximum possible efficiency is this?

a
40%
b
60%
c
66.67%
d
33.37%

detailed solution

Correct option is C

η%=(1−T2T1)×100=(1−7002100)×100=66.7%

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